Hibernate逍遥游记-第13章 映射实体关联关系-002用主键映射一对一(<one-to-one constrained="true">、<generator class="foreign">)

 <?xml version="1.0"?>

 <!DOCTYPE hibernate-mapping

 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

 <hibernate-mapping >

   <class name="mypack.Monkey" table="MONKEYS" >

     <id name="id" type="long" column="ID">

       <generator class="increment"/>

     </id>

     <property name="name" column="NAME" type="string" />

     <one-to-one name="address"

         class="mypack.Address"

         cascade="all"

      />

   </class>

 </hibernate-mapping>

 <?xml version="1.0"?>

 <!DOCTYPE hibernate-mapping

 PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"

 "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

 <hibernate-mapping >

   <class name="mypack.Address" table="ADDRESSES" >

     <id name="id" type="long" column="ID">

       <generator class="foreign">

         <param name="property">monkey</param>

       </generator>

     </id>

     <property name="city" column="CITY" type="string" />

     <property name="province" column="PROVINCE" type="string" />

     <property name="street" column="STREET" type="string" />

     <property name="zipcode" column="ZIPCODE" type="string" />

     <one-to-one name="monkey"

         class="mypack.Monkey"

        constrained="true"

     />

   </class>

 </hibernate-mapping>

 package mypack;

 public class Monkey {

     private Long id;

     private String name;

     private Address address;

     public Monkey(String name, Address address) {

         this.name = name;

         this.address = address;

      }

     /** default constructor */

     public Monkey() {

     }

     /** minimal constructor */

     public Monkey(Address address) {

         this.address = address;

     }

     public Long getId() {

         return this.id;

     }

     public void setId(Long id) {

         this.id = id;

     }

     public String getName() {

         return this.name;

     }

     public void setName(String name) {

         this.name = name;

     }

     public mypack.Address getAddress() {

         return this.address;

     }

     public void setAddress(mypack.Address address) {

         this.address = address;

     }

 }

 package mypack;

 public class Address {

     private Long id;

     private String street;

     private String city;

     private String province;

     private String zipcode;

     private Monkey monkey;

     /** full constructor */

     public Address(String province,String city,String street, String zipcode, Monkey monkey) {

         this.street = street;

         this.city = city;

         this.province = province;

         this.zipcode = zipcode;

         this.monkey = monkey;

     }

     /** default constructor */

     public Address() {

     }

     public String getStreet() {

         return this.street;

     }

     public void setStreet(String street) {

         this.street = street;

     }

     public Long getId() {

         return this.id;

     }

     public void setId(Long id) {

         this.id = id;

     }

     public String getCity() {

         return this.city;

     }

     public void setCity(String city) {

         this.city = city;

     }

     public String getProvince() {

         return this.province;

     }

     public void setProvince(String province) {

         this.province = province;

     }

     public String getZipcode() {

         return this.zipcode;

     }

     public void setZipcode(String zipcode) {

         this.zipcode = zipcode;

     }

     public mypack.Monkey getMonkey() {

         return this.monkey;

     }

     public void setMonkey(mypack.Monkey monkey) {

         this.monkey = monkey;

     }

 }

 package mypack;

 import org.hibernate.*;

 import org.hibernate.cfg.Configuration;

 import java.util.*;

 public class BusinessService{

   public static SessionFactory sessionFactory;

   static{

      try{

        Configuration config = new Configuration().configure();

        sessionFactory = config.buildSessionFactory();

     }catch(RuntimeException e){e.printStackTrace();throw e;}

   }

   public void saveMonkey(Monkey monkey){

     Session session = sessionFactory.openSession();

     Transaction tx = null;

     try {

       tx = session.beginTransaction();

       session.save(monkey);

       tx.commit();

     }catch (RuntimeException e) {

       if (tx != null) {

         tx.rollback();

       }

       throw e;

     } finally {

       session.close();

     }

   }

  public Monkey loadMonkey(Long id){

     Session session = sessionFactory.openSession();

     Transaction tx = null;

     try {

       tx = session.beginTransaction();

       Monkey monkey=(Monkey)session.get(Monkey.class,id);

       tx.commit();

       return monkey;

     }catch (RuntimeException e) {

       if (tx != null) {

         tx.rollback();

       }

       throw e;

     } finally {

        session.close();

     }

   }

   public void printMonkey(Monkey monkey){

     Address address=monkey.getAddress();

     System.out.println("Address of "+monkey.getName()+" is: "

       +address.getProvince()+" "

       +address.getCity()+" "

       +address.getStreet());

     if(address.getMonkey()==null)

       System.out.println("Can not naviagte from address to Monkey.");

   }

  public void test(){

       Monkey monkey=new Monkey();

       Address address=new Address("province1","city1","street1","100001",monkey);

       monkey.setName("Tom");

       monkey.setAddress(address);

       saveMonkey(monkey);

       monkey=loadMonkey(monkey.getId());

       printMonkey(monkey);

   }

   public static void main(String args[]){

     new BusinessService().test();

     sessionFactory.close();

   }

 }

 drop database if exists SAMPLEDB;

 create database SAMPLEDB;

 use SAMPLEDB;

 create table MONKEYS (

    ID bigint not null,

    NAME varchar(15),

    primary key (ID)

 );

 create table ADDRESSES(

    ID bigint not null,

    STREET varchar(128),

    CITY varchar(128),

    PROVINCE varchar(128),

    ZIPCODE varchar(6),

    primary key (ID)

 );

 alter table ADDRESSES add index IDX_MONKEY(ID), add constraint FK_MONKEY foreign key (ID) references MONKEYS(ID);